A corporation is treated as an entity and protects you from some personal law suits.
From a few, yes.
Financial stuff is going to rely on your personal guarantee until your business has a value measured in millions of dollars. Most other liability will come against you personally as business owner. About the best thing it helps with is when the business dies, which statistically is probably going to happen. The exact number varies, but well over 90% of businesses fail within a few years. The business structure helps minimize those losses.
And if your business succeeds, the business structure helps you buffer the money from your personal funds.
It is also costly or time consuming to report the taxes.
It can be costly, based on the state. Many states have fees in the $40 to $100 range. Some are even lower that that. However, a few states and cities (particularly California and New York) have terribly high costs.
Beware of of companies that help with setting up businesses. Many charge high fees for things like getting an EIN (which is a three-minute phone call to a free automated system) or submitting documents (which can generally be sent electronically on a free web form). Assuming the US because of business names you used, most big cities have a government office for the Small Business Administration (SBA). Pay them a visit and they can help with most of the process for free.
As for taxes, self-employment taxes and corporation taxes are higher than what you pay as a worker for income, and many people who aren't used to this feel this is double taxation. Instead it is just a tax that most wage-slaves never experience so they're surprised when they discover it exists. Taxes are on your profits and revenues. If you aren't earning much money or can document a financial loss you don't really have to worry too much about that. Be careful about that, you need to show a profit at least 3 of 5 years unless there are a few special conditions that exist. If you show a loss for any three of the first five years you'll get a special investigation for potential tax evasion.
And it costs money to set up the corporation.
Welcome to the grown up world. Registering for a business triggers many government services. You gotta pay for it.
I am concerned mainly about law suits and I do not have a lot of money.
Then you may not be in a position to start a business. Instead, keep it as a hobby that earns a small amount of money to you directly. If you want to operate under a different name, get a DBA license (Doing Business As) which works well if you want to contact people as "Josheir's Computer Repair" rather than your actual name. The money counts as direct personal income in the US, and you need to file tax forms Schedule SE (Self Employment) and 1040 Schedule C (Profit or loss from a business), so track the money that comes in so it gets reported accurately.
Is getting additional insurance for protection against law suits possible and how is it done?
Yes it is possible.
There are several types. The one closest to what you describe is generally called "Professional Liability Insurance", or "Errors and Omissions Insurance". You contact insurance companies, you explain the details of your startup including the nature of your business, the number of customers, the revenue values, and details of the business. You'll probably also want property insurance. Depending on your location some other types of insurance may be legally required. The SBA office can walk you through those.
If you are running your business from your home and people come to your location, your homeowners insurance or renters insurance may require some changes to the account.
If you hire people to work for you, you may also be required to have workers' compensation insurance, unemployment insurance, and disability insurance.
Again, it costs money to start a business. If your business is a hobby you might want to operate differently than an incorporated business.